Bodhi security (apparmor)

This might be a silly question (but I do not know it right now). Bodhi uses the Ubuntu base and this is good, considering the security features by default. Due to Bodhi's lean structure some of the apparmor settings of main Ubuntu (e.g. PDF-reader settings) are not active.

Should the average Joe like me, who has installed Okular for example, change something in the apparmor-settings (and when, how to do it?), or is it enough to enable the ufw-firewall next to a router plus careful browser habits?

I would be very pleased if someone will give me and others an answer. Thanks.